The lights were out Saturday night at the Cathedral in Palma on Spain’s island of Mallorca to mark Earth Hour 2016, but the city’s main church has shown an even greater commitment to sustainability and combating climate change by going 100 percent green through the exclusive use of renewable energy sources.

The cathedral in the Mallorcan capital has just been certified by local power company Energía de Axpo Iberia as relying entirely on renewable sources to meet all the cathedral’s energy needs, part of the cathedral administrators’ commitment to reduce the environmental impact of activities at the church and contribute to the fight against human-generated climate change by reducing its carbon footprint to zero.

Declared an historic-artistic monument in 1991, Palma’s premier Catholic church is known as “The Cathedral of Light” and is the second-tallest Gothic cathedral in Europe. As the most-visited site by tourists in Spain’s Balearic Islands, the cathedral received 900,000 visitors last year and is considered one of the most popular tourist sites in Spain.